I don't think of the time I spend in the shop wasted or some kind of negative money loss. I enjoy fixing and working on my vehicles enjoyable. After seeing some of the work "quality" shops put out and what they charge that's not an option for me. I know when I finish something it's done right wit quality parts.
As far funding I have 2 cigar boxes one I put spare or saved money. One is for near term trips, the other is for future trips. I also finally have my credit cards paid off, that helps with gas or emergencys.